That's 1 / 2 * (6-x) * 2x = 5?

1/2*（6-x）*2x＝5
（6-X）*x=5
6x-x^2=5
x^2-6x+5=0
(x-1)(x-5）=0
X = 1 or 5

2X(x+0.2)=0.6

X + 0.2 equals 0.6 divided by 2 equals 0.3
X equals 0.3 minus 0.2
Equal to 0.1

9.5×2.1−9.5÷2.1+10.5×2.1−10.5÷2.1

9.5×2.1−9.5÷2.1+10.5×2.1−10.5÷2.1
=9.5×2.1+10.5×2.1−9.5÷2.1−10.5÷2.1
=(9.5×2.1+10.5×2.1)−(9.5÷2.1+10.5÷2.1)
=(9.5+10.5)×2.1-(9.5+10.5)÷2.1
=20×2.1-20÷2.1
=42-(210-10)/21
=42-10+10/21
=32 10 / 21

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